Boiler.



No. 7m,579.

B. R. HOISINGTON.

Patented Oct. -7, I902.

B 0 l L E R (Application fllod Feb. 18, 1902.1

2 Sheets-Sheet I.

(In Model.)

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No. 710,579. I Patented Oct. 7, I902.

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BOILER.

(Application filed Feb. 18, 1902.)

(No Model.) 2 Shaets-8hat 2.

Ity- 2- OOOOOOOOO OOOOOOE UNITED STATES PATENT OFFICE.

ZENJAMIN R. HOISINGTON, OF MINNEAPOLIS, MINNESOTA.

BOILER.

SPECIFICATION forming part of Letters Patent N 0. 710,579, dated October '7, 1902.

Application filed February 18,1902. Serial No. 94,580. (No model.)

To all whom 136 may concern.-

Be it known that I, BENJAMIN R. HoIsING- TON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Boilers; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention is especially directed to the improvement of horizontal boilers; and it consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

The principal objects of my invention are to effect an economy in fuel by the provision of a boiler of greater generating efficiency, to provide a construction in which there is less danger of burning out and filling up of the flues and the joints of various other passages, and in which the fines and various other passages may be more readily cleaned and repaired. These objects I attain by my invention, the preferred form of which is illustrated in the accompanying drawings,wherein like characters indicate like parts throughout the several views.

Figure 1 is a view, principally in vertical section, but with some parts shown in full and others broken away, illustrating a boiler designed in accordance with my invention. Fig. 2 is a transverse vertical section taken on the line a x of Fig. 1, and Fig. 3 is a horizontal section on the line m of Fig. 1.

The numeral 1 indicates the horizontal boiler-section, the numera12 the fire-box, and the numeral 3 the flues, of ahorizontal boiler of the so-called locomotive type or such as used in connection with traction-engines and for various other purposes. The walls of the fire-box are water jacketed, and the rear water-jacketed wall 2 thereof is curved rearward from a point above the fuel-inlet passage 4 for an important purpose which will be hereinafter noted. Immediately overlying the fuel-inlet passage 4 and projecting inward or forward is a deflecting-plate 5. The numeral 6 indicates the dead-plate, and the numeral 7 the open grate of the fire-box, both of which are of ordinary construction. In thefunnel-like extension 8 from the fuel-inlet passage 4 is an ordinary gravity-closed door 9.

Overlying the fire-box and projecting rearward from the body of the boiler and from the front water-jacketed wall of the fire-box is a horizontally-extended water-leg 10, which at its sides runs into the vertical water-jackets 11 forward between the sides of the boiler and the sides of the fire-box. This water-leg 1O inclines gradually as it extends rearward, and at its rear end it terminates forward of the rear water-jacketed wall 2 of the firebox, so as to leave a flame-passage 12. A series of closely-positioned water-tubes 13 connect the said water-jacketed wall 2' with the rear end of the water-leg 10, and thus not only afford communication between the two parts, but assist in tying the said parts together. In the outer wall of the water-jacketed section 2 are plugs 14, located one in line with each tube 13 and serving when removed to permit a cleaning-tool to be passed through the said tube and down into the water-leg 10, thereby making it possible to always easily clean the said parts. The manhole 15 extends vertically through the water-leg 10. This manhole is normally closed by fire-brick or similar material 16, preferablyformed in. a single section and supported by lugs 17, riveted or otherwise secured to the lower wall of said water-leg.

Above the water-leg 10 is a combustion-' chamber 18, the forward vertical wall of which serves as a flue-sheet for the flues 3, which flue-sheet,itwill be noted, stands over the intermediate portion of the fire-box. The combustion-chamber 18 in longitudinal vertical section flares or tapers forward, while at its sides it is parallel and runs into the side water-jackets 11. At its rear end said oombustion-chamber 18 opens through a slightlycontracted passage 19 into an expanded upper end section 12 of the flame-passage 12. A manhole 20, which is normally'closed by a door 21, opens through the water-jacketed rear wall of the said chamber 12, or, in other words, through the upper portion of the water-jacketed rear wall 2. The passages 19 and 20 stand in line with each other and in such relation to the flues 8 that a fine-cleaner may be passed therethrough and through any and all of the said flues. This enables the fines to be cleaned from their rear ends, thereby forcing the sediment or scale-forward into the smoke-box. In previous constructions it has been necessary to clean the fines from the smoke-box end of the boiler, thereby forcing the scale or sediment back into the fire-box or combustion-chamber. This latter manner of cleaning the fines is objectionable, for the reason that a great deal of the scale cleaned from the fines will be carried back into the fines by the draft.

22 and 23 indicate the removable boilerplng, which when removed permits a cleaning-tool to be run through the sides of the boiler and into the water-leg 10 to clean the latter. It is also very important to note that the water-leg 10 at end and highest portion communicates with the top of the boiler through vertical side passages 24, formed adjacent to the neck which affords the contracted passage 19. These passages 24: permit steam which will be generated in this highest portion of the water-leg 10 to find its natural escape upward into the top of the boiler. In prior constructions where this escape of the steam from the highest point of the water-leg has not been permitted great trouble has been caused by the burning out of the section thereof wherein the steam has been caged.

With the arrangement described it is evident that the straw or other fuel upon the dead-plate 6 will not burn to anyconsiderable extent, inasmuch as the draft therethrough is cut off by the said plate and by the overlying defiecting-plate 5. Hence the flames from the fuel upon the live-grate 7 will first be directed upward against the forward portion of the water-leg 10, the lower plate of which serves as a crown-sheet, and will be caused to follow the said water-leg or crownsheet rearward until it reaches the flame-passage 12. The flames to reach the combus- Lion-chamber 18 must pass through the said passage 12, its expanded upper end 12"-, and the contracted passage 19. As the flames make their upward turn around the rearend of the water-leg 10 they are kept in contact with the curved portion 2 of the rear wall of the fire-box, which section 2*, it will be noted, is so curved as to follow the line of natural draft of the said flames. In this way the generation of steam at the point noted is greatly increased. A considerable generation of steam will also take place in the short horizontal tubes 13. These tubes further serve to catch and stop any partly-burned straw which may be carried upward by the draft, and thus keep the said incompletelyburned straw from being carried into the fines.

When the flames enter the combustionchamber 18, they are permitted to expand and to burn with great intensity, and at the same timethey are so diffused and spread out that each fine 3 will receive an approximately even heat therefrom.

WVha-t I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. A boiler having a combustion-chamber directly communicating with the fiues and overlying the fire-box, a water-leginclined upwardly and projecting rearward between the fire-box and combustion-chamber but terminating short of the rear walls of the firebox to afiord a flame-passage from said firebox to said combustion-chamber, and further provided with escape-passages leading from the highest point or upper end of said waterleg both laterally and vertically into the body of the boiler and permitting the escape of steam from the water-legwithout backing up the water therein. 2. In a boiler, the combination with the firebox and the fiues,'of the water-leg 10 projecting rearward over said fire-box and terminating short of the rear Wall thereof to afford the flame-passage 12 expanded at 12, and the combustion-chamber 18 overlying said waterleg 10 and communicating with'the expanded end 12 of said flame-passage, through the contracted neck or opening 19, the forward wall of said chamber 18 serving as a fine-sheet to which the fiues connect, substantially as described.

3. In a boiler, the combination with the firebox 2, the overlying and forwardly-flaring combustion-chamber 18 to the front plate of which the fines connect, the rearwardly-projecting and upwardly-inclined water-leg 10 extending between said fire-box and combustion-chamber, the flame-passage 12 extending between the rear ends of said water-legand the rear wall of said fire-box and terminating in the expanded chamber 12*, the manhole 20 opening into said section 12 through the rear end of the boiler, the contracted passage 19 affording communication between said chain'- bers 12 and 18, and the circulating-passages 24. extending from the rear end of said waterleg, around said contracted passage 19 and leading to the upper portion of the boiler, substantially as described.

4. In a horizontal boiler, the combination with a tire-box having a fuel-passage in its- 5. A boiler having a water-jacketed rear' 'wall, a rearWardly-projecting water-leg overlying the fire-box but terminating short of the rear wall thereof to aiford a flame-passage, a plurality of horizontal tubes connecting the inner end of said water-leg to the said waterjacketed rear wall and crossing said flamepassage, and a combustion-chamberoverlyin g said water-leg and communicating with said flame-passage and with the fines, substantially as described.

6. In a horizontal boiler, the combination with a fire-box having a water-jacketed rear wall and a fuel-passage opening therethrough, of a deflecting-plate projecting inward above the same, a water-leg projecting rearward and terminating above said deflecting-plate but leaving a flame-passage at the rear thereof, a plurality of horizontal tubes crossing said flame-passage and aifording communication between the rear end of said water-leg and the water-jacketed rear wall of said fire-box,

and a combustion-chamber overlying said water-leg and communicating with said flamepassage and with the fiues, substantially as described.

7. A boiler provided with the fire-box 2, with fuel-inlet passage 4 deflecting-plate 5 and water-jacketed rear wall curved rearward and upward at 2, in combination with the rearwardly-projecting water-leg 1O overlying 

